17 files declare their use of SearchApiSolrException in Search API Solr 4.x

AbstractSolrEntityListBuilder.php in src/Controller/AbstractSolrEntityListBuilder.php

SearchApiSolrAdminCommands.php in modules/search_api_solr_admin/src/Commands/SearchApiSolrAdminCommands.php

SearchApiSolrBackend.php in src/Plugin/search_api/backend/SearchApiSolrBackend.php

SearchApiSolrCommands.php in src/Commands/SearchApiSolrCommands.php

SearchApiSolrDevelCommands.php in modules/search_api_solr_devel/src/Commands/SearchApiSolrDevelCommands.php

SearchApiSolrTest.php in tests/src/Kernel/SearchApiSolrTest.php

search_api_solr.install in ./search_api_solr.install

Install, update and uninstall functions for the Search API Solr module.

SolrAdminCommandHelper.php in modules/search_api_solr_admin/src/Utility/SolrAdminCommandHelper.php

SolrCommandHelper.php in src/Utility/SolrCommandHelper.php

SolrConfigSetController.php in src/Controller/SolrConfigSetController.php

SolrConnectorPluginBase.php in src/SolrConnector/SolrConnectorPluginBase.php

SolrFieldTypeListBuilder.php in src/Controller/SolrFieldTypeListBuilder.php

SolrUploadConfigsetForm.php in modules/search_api_solr_admin/src/Form/SolrUploadConfigsetForm.php

StandardSolrCloudConnector.php in src/Plugin/SolrConnector/StandardSolrCloudConnector.php

StandardSolrConnector.php in src/Plugin/SolrConnector/StandardSolrConnector.php

StreamingExpressionBuilder.php in src/Utility/StreamingExpressionBuilder.php

Utility.php in src/Utility/Utility.php